Which of the following is correct

I. You can deduct $50\%$ of your self$-$employment tax on your income taxes.

II$.$ If you are an independent contractor, you are only responsible for a combination of $6\mathrm{.}2\%$ for Social Security and $1\mathrm{.}45\%$ for Medicare.

$1$

II

$1$ and $11$

None